Viewing the Temperature
Use the Temperature sub tab to view a graph of water temperature
changes over a period of time. The graph reads from right to left
so that the most recent temperature measured appears on the far
right side of the graph. The dotted lines within the graph indicate
intervals in the temperature scale and the duration of time. To view
temperature information, you must select
Temp or Temp, Spd
as
the transducer type on the Setup sub tab.
NOTE:
You must be receiving proper sonar data from another
device, such as Garmin GSD 21 Sounder Module, to view
temperature information.
To access the Temperature sub tab:
1. Highlight the
Sonar
tab on the Main Menu.
2. Select the
Temperature
sub tab.
Temperature Sub Tab
Changing the Temperature Display
The graph will adjust and show the temperature changes according
to the
Temperature Scale
and
Time Duration
settings.
Temperature Scale
—select a degree span from the list. Select
Auto
to have the unit automatically determine the best range, or select a
span of 2, 4, 6, 8, or 10 degrees.
Time Duration
—set how fast or slow the temperature log scrolls; a
shorter time duration means a faster temperature log scroll. Select a
duration from 1 minute to 2.5 hours.
Resetting the Temperature Graph
To reset the scale range for the temperature graph, press
MENU
,
highlight
Reset Auto Scale
, and press
ENTER
. This is useful
when the scale spans a large range due to extreme temperature
changes. You can reset the scale only when you select
Auto
for the
Temperature Scale
.
To restore the temperature graph to defaults, press
MENU
, highlight
Restore Default
, and press
ENTER
.
GPSMAP 378/478 Owner’s Manual
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